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Retirement and Post-Retirement Benefit Plans - Summary of Pre-Tax Net Actuarial Loss (Gain) and Prior Service Benefit Recognized in Accumulated Other Comprehensive Loss for Defined Benefit and Post-Retirement Benefit Plans (Details)
$ in Millions
Oct. 31, 2018
USD ($)
Post-Retirement Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net actuarial loss (gain) $ (180)
Prior service benefit (74)
Total recognized in Accumulated other comprehensive loss (gain) (254)
U.S. | Defined Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net actuarial loss (gain) 1,285
Prior service benefit 0
Total recognized in Accumulated other comprehensive loss (gain) 1,285
Non-U.S. | Defined Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net actuarial loss (gain) 311
Prior service benefit (17)
Total recognized in Accumulated other comprehensive loss (gain) $ 294